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gaining time
Hi Folks
I'm hopeing that somebody here can settle an argument for me and a mate. The days get longer and shorter during the year ,because of the earth tilt to its axis... Is the time gained or lost each day constant.. I reckon its got to be something between 30 and 55 secondes of extra daylight (or darkness) each day and that whatever the figure is it will always stay the same... but my mate reckons that this figure increases as the longest day approaches so for example its an extra minute of daylighht in March but by June were getting twio extra minutes... Any chance some body could settle this argument cheers Will |
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"will" wrote in message m... Hi Folks I'm hopeing that somebody here can settle an argument for me and a mate. The days get longer and shorter during the year ,because of the earth tilt to its axis... Is the time gained or lost each day constant.. I reckon its got to be something between 30 and 55 secondes of extra daylight (or darkness) each day and that whatever the figure is it will always stay the same... but my mate reckons that this figure increases as the longest day approaches so for example its an extra minute of daylighht in March but by June were getting twio extra minutes... Any chance some body could settle this argument Hi Will, The main variation in the length of the day varies as a sine wave over the year. The exact shape depends on your position on the earth's surface, but it is a smooth curve as shown in http://www.islandnet.com/~see/weathe...tos/sungrf.gif * As you can see, the length of the day depends on the height of the graph; but to measure the daily gain or loss you need to look at the _slope_ of the graph. As Martin has already said, the slope is steepest in March and September (when the daylight time is closest to 12 hours exactly), I find the graph helps to see why this is the case. Hope this helps Owen *the graph shows length of day, and also the amount of sunlight energy falling per day; summer's sunlight is brighter, so the insolation curve is 'pointier'. |
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(will) wrote in alt.astronomy:
Any chance some body could settle this argument http://www.rfleet.clara.net/graphdark/download.htm can show you who's right. Nifty program. -- CeeBee "I am not a crook" |
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"eyelessgame" wrote in message om... (will) wrote in message om... Hi Folks ... Any chance some body could settle this argument Gosh, if only there were some resource you could consult where you could settle this for yourself. Maybe, if we hooked a whole bunch of computers together, and let them talk to each other, somebody might write a computer program that could calculate sunrise and sunset times! Yup, its a shame there's no way of tapping into a community of enthusiasts. I'm sure there must be some who would be more than happy to answer genuine questions. It would also be really good if it could be arranged if when someone gives incorrect information someone else could gently and politely let them know. Does anyone on this NG have any ideas how this could be arranged? ;-) |
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#8
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"will" wrote in message m... Hi Folks I'm hopeing that somebody here can settle an argument for me and a mate. The days get longer and shorter during the year ,because of the earth tilt to its axis... Is the time gained or lost each day constant.. I reckon its got to be something between 30 and 55 secondes of extra daylight (or darkness) each day and that whatever the figure is it will always stay the same... but my mate reckons that this figure increases as the longest day approaches so for example its an extra minute of daylighht in March but by June were getting twio extra minutes... Any chance some body could settle this argument cheers Will Hi Will, I thought about this a couple of years ago. I guessed that the sunrise times would closely follow a sign wave, and wanted to see if it was right. The only tool I'd got was SKYGLOBE. I noted sunrise times for each week and plotted the results on a graph. The result is on http://www.geocities.com/wjp_gof/sunrise.doc |
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